stock k03 in good condition can make bit over 300hp, k03 hybrides probably are able to produce even 400hp, my friend has those but right now he waits for dyno so i cant tell for sure what numbers he will get, but compressor case walls are very very thin in this case, guy who made turbos for me did not wanted to take risk so i went for chinese k04 with melett cores. if you dont shoot for over 300hp i sugest going with k03 with a bit bigger compressor wheel it would give you better performance over 4k rpm and you wont need to replace turbo inlets
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You have mildly put overly optimistic dyno or you are mixing something up. Even a S3 with K04 barely does 280hp.
